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Let us take a look at a group delay measurement made on the Anritsu
37347E Vector Network Analyzer. Group delay, as a measurement op
-
tion, can be found in the Graph Type menu. After selecting the option,
the VNA displays the data in a time-vs-frequency graph, or to be more
exact, a group-delay-vs-frequency graph (Figure 8-17).
The 37xxxE automatically selects the frequency spacing between data
points—that is, the aperture. Notice that this value is displayed on the
screen with the measurement (Figure 8-18).
GROUP DELAY MEASUREMENTS
8-22 37xxxE OM
S 2 1 F O R W A R D T R A N S M IS S IO N
G R O U P D E L A Y
R E F = 1 .0 0 0 n S 6 0 0 .0 0 0 p S /D IV
9 .0 0 0 0
3 .0 0 0 0 G H z
Figure 8-17. Group Delay-vs-Frequency Graph
S 2 1 F O R W A R D T R A N S M IS S IO N
G R O U P D E L A Y
R E F = 1 .0 0 0 n S 6 0 0 .0 0 0 p S /D IV
9 .0 0 0 0
3 .0 0 0 0 G H z
Figure 8-18. Group Delay Screen Showing Aperture